A filter device for desalinated water

Abstract

This utility model relates to the field of chemical wastewater post-treatment equipment, specifically to a filtration device for desalination, which solves the problem of high water consumption in existing filtration devices. It includes a first filter tank and a second filter tank arranged sequentially for filtering a first raw liquid and a second raw liquid, respectively. The purity of the first raw liquid is lower than that of the second raw liquid. The second filter tank includes a second tank body and a second tank cover. The upper part of the second tank body has a secondary inlet for the second raw liquid to enter, and the lower end has a secondary outlet. Filter bags for filtration are installed inside the second tank body. The first filter tank includes a first tank body and a first tank cover. The upper part of the first tank body has a primary inlet for the first raw liquid to enter, and the lower end has a primary outlet. Filter plates for flocculation filtration are installed inside the first tank body, and a discharge trough is provided at the lower end of the filter plates. A cleaning nozzle is installed inside the first tank body, and the cleaning nozzle is connected to the supply source of the second raw liquid.

Description

Technical Field

[0001] This utility model relates to the field of chemical wastewater post-treatment equipment, specifically to a filtration device for desalinated water. Background Technology

[0002] With mature water treatment technologies, energy conservation and consumption reduction are now the main directions pursued in water treatment processes. Currently, in the desalination production process, the precipitates generated after adding flocculants during the pretreatment of raw water tend to accumulate at the bottom of the equipment and are difficult to remove. Excessive precipitates in the transferred treated raw water can easily cause pipeline blockage, affecting the normal operation of the equipment. Existing filters often suffer from problems such as high frequency of filter element cleaning, high water consumption, high cost, and potential environmental pollution. Utility Model Content

[0003] Therefore, this utility model provides a filtration device for desalinated water, which solves the problem of high water consumption in existing filtration devices.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A filtration device for desalination includes a first filter tank and a second filter tank arranged sequentially for filtering a first raw liquid and a second raw liquid, respectively. The purity of the first raw liquid is less than that of the second raw liquid. The second filter tank includes a second tank body and a second tank cover on the second tank body. The upper part of the second tank body is provided with a secondary inlet for the second raw liquid to enter, and the lower end is provided with a secondary outlet. A filter bag for filtration is installed inside the second tank body.

[0006] The first filter tank includes a first tank body and a first tank cover. The upper part of the first tank body is provided with a primary water inlet for the entry of the first raw liquid, and the lower end is provided with a primary water outlet. The primary water outlet is connected to the secondary water inlet.

[0007] The first tank lid is provided with an inlet for placing flocculant, and the first tank body is provided with a filter plate for flocculant filtration, and the lower end of the filter plate is provided with a discharge trough for flocculant discharge.

[0008] The first tank is equipped with a cleaning nozzle for discharging sediment from the discharge trough, and the cleaning nozzle is connected to the supply source of the second raw liquid.

[0009] Preferably, the filter plate is spirally attached to the inner surface of the first tank, and water is introduced through the primary water inlet to allow the first raw liquid to be spirally transferred downward along the filter plate. The feed inlet is located on the first tank cover above the primary water inlet.

[0010] Preferably, the width of the filter plate gradually decreases from top to bottom.

[0011] Preferably, the second tank cover is provided with a pressure gauge interface and an exhaust port.

[0012] Preferably, the second tank body is provided with a horizontally arranged ring-shaped frame plate inside. The frame plate is a ring structure with an opening, and the lower end of the frame plate is provided with a spiral guide plate for the filter bag to be rotated and loaded.

[0013] By adopting the aforementioned technical solution, the beneficial effects of this utility model are:

[0014] This technical solution connects the cleaning nozzle to the supply source of the second concentrate, enabling the backwashing of sediment in the first filter tank using the second concentrate (which has higher purity). This design fully utilizes the fluidity and purity advantages of the second concentrate, eliminating the need for external rinsing media during the cleaning process. This reduces water waste and avoids the risk of secondary contamination due to differences in media. Simultaneously, the flushing action of the second concentrate effectively removes flocculated sediment from the discharge trough, significantly extending the maintenance cycle of the first filter tank and improving the overall system operating efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram showing the flow direction of the first raw liquid on the filter plate in an embodiment of this utility model.

[0017] Reference numerals: 1. First filter tank; 11. First tank body; 12. First tank cover; 121. Feed inlet; 13. Primary water inlet; 14. Primary water outlet; 15. Filter plate; 16. Discharge trough; 17. Cleaning nozzle; 2. Second filter tank; 21. Second tank body; 22. Second tank cover; 221. Pressure gauge; 222. Vent; 23. Secondary water inlet; 24. Secondary water outlet; 25. Filter bag; 251. Metal support ring; 26. Frame plate; 27. Spiral guide plate. Detailed Implementation

[0018] The following will describe the implementation of this utility model in detail with reference to specific embodiments, so that the process of how this utility model uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0019] Example

[0020] refer to Figure 1A filtration device for desalination includes a first filter tank 1 and a second filter tank 2 arranged sequentially for filtering a first raw liquid and a second raw liquid, respectively. The purity of the first raw liquid is less than that of the second raw liquid. The second filter tank 2 includes a second tank body 21 and a second tank cover 22 covering the second tank body 21. The upper part of the second tank body 21 is provided with a secondary inlet 23 for the second raw liquid to enter, and the lower end is provided with a secondary outlet 24. A filter bag 25 for filtration is installed inside the second tank body 21.

[0021] The first filter tank 1 includes a first tank body 11 and a first tank cover 12. The upper part of the first tank body 11 is provided with a primary water inlet 13 for the entry of the first raw liquid, and the lower end is provided with a primary water outlet 14. The primary water outlet 14 is connected to the secondary water inlet.

[0022] The first tank cover 12 is provided with an inlet 121 for placing flocculant, and the first tank body 11 is provided with a filter plate 15 for flocculant filtration. The lower end of the filter plate 15 is provided with a discharge trough 16 for flocculant discharge.

[0023] The first tank 11 is equipped with a cleaning nozzle 17 for discharging sediment from the discharge trough 16. The cleaning nozzle 17 is connected to the supply source of the second raw liquid, and a pump is installed on the supply pipe of the cleaning nozzle 17 to provide pressurized spraying. This technical solution achieves the function of backwashing the sediment in the first filter tank 1 using the second raw liquid (with higher purity) by connecting the cleaning nozzle 17 to the supply source of the second raw liquid. This design fully utilizes the fluidity and purity advantages of the second raw liquid, eliminating the need to introduce external rinsing media during the cleaning process, thus reducing water waste and avoiding the risk of secondary pollution caused by media differences. At the same time, the flushing action of the second raw liquid can efficiently remove flocculated deposits on the discharge trough 16, significantly extending the maintenance cycle of the first filter tank 1 and improving the overall operating efficiency of the system.

[0024] Structurally, such as Figure 2As shown, the filter plate 15 is spirally attached to the inner surface of the first tank 11. Water enters through the primary inlet 13 to allow the first raw liquid to spirally flow downwards along the filter plate 15. The filter plate 15 has an L-shaped cross-section and raised edges to facilitate fluid transport. The feed inlet 121 is located on the first tank cover 12 above the primary inlet 13. The filter plate 15 is spirally attached to the inner surface of the first tank 11, and the tangential water inlet design of the primary inlet 13 creates a spiral downward flow channel for the first raw liquid along the filter plate 15. This structure significantly enhances the mixing uniformity and reaction time of the flocculant and raw liquid by extending the fluid path length, ensuring that the flocculant fully adsorbs impurities. The centrifugal force generated by the spiral flow channel further promotes the aggregation of flocculent particles onto the surface of the filter plate 15, improving flocculation filtration efficiency while avoiding short-circuiting and optimizing the processing capacity of the first filter tank 1.

[0025] Based on this, as referenced Figure 1 As shown in the cross-sectional width of the filter plate 15, the width of the filter plate 15 gradually decreases from top to bottom. This design, where the width of the filter plate 15 gradually decreases from top to bottom, effectively solves the problem of flocculation and clogging. The wider upper area of ​​the filter plate 15 provides ample space for the reaction between the flocculant and impurities, promoting the formation of large-particle flocculation. As the fluid flows downwards, the width of the filter plate 15 narrows, and the flow velocity gradually increases. Shear force is used to peel off the formed flocculated blocks and guide them to the discharge trough 16, preventing excessive accumulation of flocculated material on the surface of the filter plate 15. This dynamic balance design ensures filtration accuracy while reducing the frequency of manual cleaning.

[0026] In this embodiment, the second tank cover 22 is provided with a pressure gauge 221 interface and a vent 222. The provision of the pressure gauge 221 interface and the vent 222 significantly improves the safety and stability of the device.

[0027] The interface of pressure gauge 221 is connected to pressure gauge 221, which can monitor the pressure change in the second filter tank 2 in real time, provide key operating parameters for operators, facilitate timely detection of filter bag 25 blockage or system abnormality, and avoid the risk of equipment damage or leakage due to excessive pressure.

[0028] The exhaust port 222 automatically discharges the gas accumulated in the filter tank during startup or operation, preventing air resistance from affecting the uniformity of water flow distribution and ensuring that the filter bag 25 is fully wetted and maintains a stable filtration efficiency.

[0029] In this embodiment, the second tank 21 is provided with a horizontally arranged ring-shaped support plate 26 inside. The support plate 26 is a ring-shaped structure with an opening, and the lower end of the support plate 26 is provided with a spiral guide plate 27 for the filter bag 25 to be rotated and inserted. The design of the horizontal ring-shaped support plate 26 and the spiral guide plate 27 in the second filter tank 2 realizes the quick tool-free disassembly and assembly of the filter bag 25.

[0030] Open-ended annular support plate 26: While providing horizontal support for the filter bag 25, its open structure allows the filter bag 25 to slide in or out horizontally without vertical hoisting, simplifying the replacement process. The metal support ring 251 at the opening of the filter bag 25 can be directly snapped onto the support plate 26.

[0031] Spiral guide plate 27: By rotating the filter bag 25, it can be inserted into or removed from the frame plate 26 along the spiral trajectory. The metal support ring 251 on the filter bag 25 is larger than the size of the opening in the middle of the frame plate 26. Through the threaded structure of the spiral guide plate 27, the filter bag 25 can be installed / removed by using the thread self-locking principle, avoiding the cumbersome steps of traditional bolt tightening, significantly shortening the maintenance time of the filter bag 25 and reducing downtime losses.

[0032] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A filtering device for desalinated water, comprising a first filter tank (1) and a second filter tank (2) arranged in sequence for filtering a first raw liquid and a second raw liquid, respectively, the first raw liquid having a lower purity than the second raw liquid, characterized in that: The second filter tank (2) includes a second tank body (21) and a second tank cover (22) covering the second tank body (21). The upper part of the second tank body (21) is provided with a secondary water inlet (23) for the second raw liquid to enter, and the lower end is provided with a secondary water outlet (24). The second tank body (21) is equipped with a filter bag (25) for filtration. The first filter tank (1) includes a first tank body (11) and a first tank cover (12). The upper part of the first tank body (11) is provided with a primary water inlet (13) for the entry of the first raw liquid, and the lower end is provided with a primary water outlet (14). The primary water outlet (14) is connected to the secondary water inlet. The first tank cover (12) is provided with an inlet (121) for placing flocculant, and the first tank body (11) is provided with a filter plate (15) for flocculant filtration. The lower end of the filter plate (15) is provided with a discharge trough (16) for flocculant discharge. The first tank (11) is equipped with a cleaning nozzle (17) for discharging sediment from the discharge trough (16), and the cleaning nozzle (17) is connected to the supply source of the second raw liquid.

2. A filter device for desalinated water according to claim 1, characterized in that: The filter plate (15) is spirally attached to the inner surface of the first tank (11). Water enters through the primary water inlet (13) so that the first raw liquid is spirally transferred downward along the filter plate (15). The feed inlet (121) is located on the first tank cover (12) above the primary water inlet (13).

3. A filtration device for desalinated water according to claim 2, characterized in that: The width of the filter plate (15) gradually decreases from top to bottom.

4. A filtration device for desalinated water according to claim 1, characterized in that: The second tank cover (22) is provided with a pressure gauge (221) interface and an exhaust port (222).

5. A filtration device for desalination according to any one of claims 1-4, characterized in that: The second tank (21) has a horizontally arranged frame plate (26) inside. The frame plate (26) is a ring structure with an opening. The lower end of the frame plate (26) is provided with a spiral guide plate (27) for the filter bag (25) to be rotated and loaded.

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